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AS7038RB

Functional Description

Datasheet

• PUBLIC

DS000726

• v2-00 • 2021-Jun-02

126

│ 60

7.1.11

Optical Signal Conditioning

Figure 74:

Optical Signal Conditioning

Synchronous Demodulator

Two optional synchronous demodulators can be used to detect small optical signals in the presence of

large unwanted noise (ambient light). Since the detector synchronizes to the LED frequency, the

demodulator can only be used of the measurement sequencer is running.

It includes input filer (adjustable high pass and low pass, notch filter) and 2nd order adjustable output

low pass. The demodulator itself multiplies the signal by +1 / 0 / -1 with a timing which is controlled by

the sequencer.

Information

The optical signal conditioning stage need sigref_en=1 for operation.

ADC

ofe1/2_sd_byp

Synchronous Demodulator1,2 + BP Filter + Gain Stages

From TIA

ofe1/2_hp_byp

ofe1/2_sd_bw

aa_freq

12.5-200Hz

ofe1/2_en

ofe1/2_hp_freq

ofe1/2_hp_en

ofe1/2

_gain_g

Clip Det

gain_sd

h/l vth

FiFo

Prefilter

pregain

ofe1

ofe2

sd1

sd2

tia

ofe_notch

_sel60

ecg_notch_byp

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